Migration Poller/NPM

Hello;

I would like to know your thought about this migration procedure:

1) Server 1 : NPM + Poller Server 2 : DB

2) Add third server with additional Poller. Server 3 : Poller

3) Move devices to new poller at Server 3

4) Move NPM from Server 1 to Server 3

5) Move DB from Server 2 to new Server 4 DB

Step 4 and 5 are at the same time.

Any thoughts or suggestions?

Thank you

Julio